If you weren't able to come to SI, here's some suggested problems from the chapter and the end chapter review that I mentioned. I think my problem and section numbers appear to be +1 larger than yours, so keep that in mind when you look these up. Subtract 1 off the problem numbers. So that you can check and make sure to see what's what, I've listed my chapter sections and accompanying problems under each, so there's no confusion. Sections are in red, recommended problems are in black. I've also added this list to my blog - pass it around and let people know!
18-8 Syn of Ketones and Aldehydes Using 1,3-diathianes
18-7
18-9 Synthesis of Ketones from COOH
18-8
18-10 Synthesis of Ketones from Nitriles
18-9, 18-10
18-11 Synthesis of Aldehydes and Ketones from Acid Chlorides
18-11
18-12 Reactions of Ketones and Aldehydes: Nucleophilic Addition
18-12
18-13 The Wittig Reaction
18-17
18-14 Hydration of Ketones and Aldehydes
18-18, 18-19
18-15 Formation of Cyanohydrins
18-20, 18-21
18-16 Formation of Imines
18-22, 18-24
18-17 Condensation with Hydrozylamine and Hydrazines
18-27, 18-28
18-18 Formation of Acetals
18-29, 18-30, 18-31
18-19 Acetals as Protecting Groups
18-34
18-20 Oxidation of Aldehydes
18-35
18-21 Reductions of Ketones and Aldehydes
18-36, 18-37
End Chapter Review Problems (The first problem in the end chapter review listed for me is 18-38. If that's the same number as yours, then good - the numbers will match. If it's not, subtract accordingly, with what yours is.)
18-49
18-50
18-51
18-52
18-53
18-56
18-60
18-61
18-62
18-63
18-66
18-70
Keep in mind that the synthesis problems are going to be where you want to spend your time. Good luck guys!